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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: frame-local variables weirdness
Date: Fri, 08 Dec 2006 20:26:25 -0500
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I don't think that Emacs has any way to cancel what
make-variable-frame-local does.  We never tried to implement one.
Likewise there is no way to cancel what make-variable-buffer-local
does.  I am not surprised that confusion happens if you try doing both
to the same variable, because they are conflicting states.

I don't think we should try to change this now.